Sectional boiler.



639,574. Patented Dec. I9, I899.

H. M. HOFFMAN.

SECTIUNAL BOILER. (A pplication f lled Aug. 19, 1899.)

(Nu-Model.)v

4 Sheets8heef I.

INVENTUB WITNESSES No. 639,574. Patented Dec. l9, I899.

H. M. HUFFMAN,

SECTIDNAL BOILER.

Application filed Aug. 19, 1899.)

4 Sheets-Sheat 2.

No Model.)

INVENTU ii T N ESE E m: norms Pawns co PHoYoumu. WASNINGTON. u. c

No. 639,574. Patentedflec. l9, I899.

-H. m. HOFFMAN.

SECTIDNAL BOILER.

(Application filed Aug. 19, 1899.) (No Model.) 4 Shaats8heat 3.

V INVENTEIR m: yonms PETERS co. Pnofo-umou WASHINGTON u. c.

Patented Dec. l9, I899.

H. M. HOFFMAN.

SEGTIONAL BOILER.

(Application filed Aug. 19, 1999. 4 Shaots$heet 4.

FIG--9- F I C3111- WITN A 5555 fiy f e:

HENRY M. HOFFMAN, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF .TO ISAAC S. WEAVER, OF SAME PLACE.

SECTIONAL BOILER.

SPECIFICATION formingpart of Letters Patent No. 639,574, dated December 19, 1899.

Application filedAugust 19,1899. Serial No. 727,739. (No model.)

To all whom it may concern.-

Be it known that I, HENRY M. HOFFMAN, of the city of Baltimore and State of Maryland, have invented certain Improvements in Sectional Boilers to be Used in Hot-Water Heating, of which the following is a specification.

This invention relates to certain improvements in boilers for the above-named purpose IO which are built u p of cast-iron sections placed face to face and interiorly connected, so as to admit of the free passage of water from one section to another.

The said invention consists in certain pcculiarities of construction of the said sections and their attachments, as will hereinafter fully appear.

In the further description of the said invention which follows reference is made to the accompanying drawings, forming a part hereof, in which- Figure 1 is an exterior front view of the improved sectional boiler. Fig. 2 is a section of Fig. 1, taken on the dotted line 1 1. Fig.

3 is a front view of the front section of the boiler with the doors shown in Fig. 1 omitted. Fig. 4 is either a front or a rear View of one of the intermediate sections of the boiler.

Fig. 5 is a section of Fig. 1, taken on the dotted line 2 2. Fig. 6 is a back View of the rear section of the boiler. Fig. 7 is a cross-section of a part of Fig. 3, taken on the dotted line 3 3. Fig. 8 is a cross-section of a part of Fig.

3, taken on the dotted line 4 1. Fig. 9 is a cross-section of a part of Fig. 4, taken on the dotted line 5 5. Fig. 10 is a cross-section of Fig. 4, taken on the dotted line 6 '6. Fig. 11

is a cross-section of Fig. 6, taken on the dotted line 7 7.

Referring now particularly to Figs. 2, 4, and 5 of the drawings, it will be seen that each of the intermediate sections of the boiler con sists of the hollow legs A, connected at the top by the hollow crescent-shaped crown B and below the crown by the hollow arch O, the upper edge of which is concentric with the lower edge of the crown.

The space D between the crown and arch is for the passage of the products of combus- 50 tion toward the rear of the boiler, as hereinafter described, and it is divided by the hollow central partition a, which places the crown and arch in communication at that point. p

The hollow arch O is provided with openings E, through which the products of combustion pass toward the front of the boiler.

Below the hollow arch O and forming a downward extension thereof is the hollow curved and corrugated plate .F. Figs. 9 and 10 show cross-sections of portions of this corrugated plate.

By reference to Fig. 5 it will be seen that the hollow arches O of the adjoining intermedi ate sections come practically together at the extreme edges, they being separated only by some joint-forming substance, such as asbestos, and also at the upper edge of the hollow arch O, which has a facing b flush with the facing c at the extreme edges of the sections; but the hollow arches below the facing Z2 stand apart (see Fig. 5) in order that the products of combustion from the furnace may pass upward to the flue formed by the openings E, as shown by the arrows in full lines in Fig. 5.

The intermediate sections of the boiler are interiorly united, as also with the front and rear sections, hereinafter described, by means of nozzles G on the crown and legs, and all, So the sections are tied together by bolts d, which pass through these'nozzles from one end of the boiler to the other. The said bolts are shown only in Figs. 1 and 3.

The front section H differs from the intermediate sections just described in that the arch 0, except the lower part thereof adjoining the hollow corrugated plate F, is omitted, whereby the space D and the opening E in the intermediate section next to the front sec- 0 tion are placed in communication, so as to allow the products of combustion to take the direction shown by the arrows in Fig. 5. It also differs from the intermediate sections in that the corrugations are on the inner surface of the plate F only (see Figs. 7 and 8) and that the plate is continued down to the gratebars, which are denoted by a dotted line in Figs. 2 and 5. The front section is provided with the furnace-door opening Z and the openrooings J, whereby the boiler is cleaned.

The furnace, cleaning, and ash-pit doors,

respectively denoted by f, g, and h, are shown only in Fig. 1, and they are applied directly to the fiat face of the front section.

The rear section K of the boiler corresponds very closely in construction with the front one, the principal difference being that the plate F is corrugated at both sides thereof (see Fig. 11) and that there are no doonopenings therein, and the portion below the line of the grate-bars, which, as before stated, are represented by a dotted line in Figs. 2 and 5, consists of a single plate 7r.

To the rear section K is secured in any suitable manner the smoke-box L, having a central partition m, which extends from the top to a point some distance from the bottom. (See Figs. 2 and 5.) In this partition is a. draft-damper M, operated from the exterior of the boiler, which when opened allows the products of combustion to pass directly to the smoke-pipe N, butwhen closed forces the gases to pass under the said partition before entering the smoke-pipe, as shown by the dotted arrows in Figs. 2 and 5. This smoke-box constructed and applied as described oifers a convenient means of effecting a direct and an indirect draft without aifecting the construction of the boiler-sections.

The intermediate and rear sections are provided with nozzles 0, into any one of which is screwed the pipe (not shown) which conducts water to the heating-radiators and with similar nozzles P in the-legs for the return-water pipe. The nozzles which are unused are stopped by screw-plugs. (Not shown.)

I claim as my invention 1. In asectional boiler, an intermediate section thereof, which comprises hollow legs connected at the top by a hollow crescentshaped crown, a hollow arch which is removed a suitable distance from the crown to form a space for the passage of the products of combustion toward the rear end of the boiler, connected to the crown centrally thereof bya hollow partition, the said hollow arch having openings through which the products of combustion pass toward the front of'the boiler, and a hollow curved and vertically-corrugated plate forming a downward extension of the arch, the said crown and legs being provided with nozzles which serve as means of communication between the interior of the section and that of others of a similar character, when the sections are placed face to face, substantially as specified.

2. In combination with the front and rear sections of a sectional boiler, a series of intermediate sections, each one of which comprises hollow legs united at the top by a hollow crescent-shaped crown and a hollow arch which is moved a suitable distance from the crown to form a space for the passage of the products of combustion toward the rearend of the boiler, the said hollow arch having opcnings through which the products of combustion pass toward the front of the boiler, and a hollow curved and vertically-corru gated plate forming a downward extension of thesaid arch, the said crown and legs of each section being provided with nozzles which serve as means of communication between the sections, substantially as specified.

3. In a sectional boiler, the combination with the rear section thereof, of a smoke-box with a smoke-pipe leading therefrom, having a partition-plate extending from its topto a point removed some distance from the bottom, the said partition being provided with a swinging damper therein, substantially as and for the purpose specified.

HENRY M. HOFFMAN.

W'itnesses:

JOHN L. HEBB, HARRY E. FEE. 

